I am currently rebuilding my Emma II simulator that I began at the beginning of the year.

The reason for the rebuild is that I have successful gotten my Emma II board to work and so now want to make my simulator mimic the exact behaviour as much as possible. Previously it was an excuse to get a system to replicate the processing of the 6502 but now I can go further.

I have found a conversation from 2010 (last post was 2013 but this was a later add on comment): viewtopic.php?f=4&t=2388

I have also messaged one of those on the topic but to no avail unfortunately. On this topic is a mention of the routines within the monitor eeprom (SE116/A, in my case) and a list of routine names:

Data Insert Routine
Display 8
Display routine
Multiply by 10
Multiply by 16
Hex2Dec/Dec2Hex
Branch Offset Calculator
Re-locator
Checksum Routine
Write 4 Characters to display
Display Memory Contents
Display Memory Contents of indirect address
Display Accumulator Contents.
Display 4 Characters
Read the Keys
Output Data to the Cassette interface
Input Data from the Cassette interface

Does anyone have any further information on how these routines worked, what their function was? Anything that may help me in my hunt?

Someone else on there mentioned that they had a series of manuals for the Emma II. I have the Hardware Manual, the User Manual and the Instruction Set but nothing else. Can anyone help in this respect?

I am currently encoding the 7 segment display system and trying to work out the best way of doing this. I have 7 segments (woohoo) and the decimal point. I remember these needing octal values for the seven segment but the decimal point? I'm assuming a nibble for each segment; therefore to display a full address would require two bytes - ignoring the A for address that first appears and so makes it an additional nibble. Am I right here? Would it me MSB defining the decimal or the LSB with the remaining bits being the main 7-segment display?

Any and all help gratefully received.

****Found the information in the user manual and extracted the actual code via my own Emma II board.****

Garynewport, are you still around and do you definitely have the hardware manual? Would be great to get a scan of that available here or somewhere. I'd be glad to cover expenses for doing that.

john - colorado springs, co

(Garynewport - I see you note that you've extracted code - I encourage you to share it! Post here as a zip attachment, or PM me if you can't find a way.)